JPS61105258A - Wiper blade rubber - Google Patents

Abstract

PURPOSE:To facilitate setting a wiper blade rubber in a holding member, by furnishing a fixing projection consisting of a neck part, and a head part which is at the top of the neck part with a little larger width than the neck part, and inserting the projection into the holding member by bending inside the both edges of the head part. CONSTITUTION:The wiper blade rubber is composed of a base 1 with a polygonal section, a neck member 2, a swaying member 3 with a triangular section, and a lip member 4 arranged at the top of the swaying member 3. In this case, while the base 1 is composed of plural wings 12 to 14 of different widths each other, a projection 15 for fixing purpose is furnished at the upper side center of the base 1. The fixing projection 15 is formed of a neck part 11, projecting upward from the center of the wing 12 opposite to the neck member 2, and the head part 10 at the top of the neck part 11 with the width a little larger than the neck part 11. Between the both edges 10a of the head part 10 and the neck part 11 is formed a concave part 16, so that the head part 10 can be inserted into the holding member by bending inside the both edges 10a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to wiper blade rubber used in automobiles and the like. This wiper blade rubber is used while attached to a holding member, and moves along the surface of glass or the like, and its sliding action functions to remove water droplets and the like from the surface.

[Prior Art] Wiper blade rubber generally has a thick base, a swinging part with a substantially triangular cross section, a neck connecting the swinging part and the base, and a tip end of the swinging part. It is constructed in a longer shape than the provided thin plate-like lip portion.

When installing this wiper blade rubber, conventionally, the wiper blade rubber is inserted into the holding member by relatively moving the long wiper blade rubber in the length direction of the holding member.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, since the long wiper blade rubber is moved relative to its length, the insertion distance becomes long and it is difficult to insert the wiper blade.

Furthermore, recently, it has been considered to construct wiper blade rubber from EPDM rubber, which is chemically stable and has excellent ozone resistance and weather resistance. However, when the wiper blade rubber is made of EPDM rubber, although it has the advantage of being chemically stable as described above, it becomes difficult to insert it into the holding member.

The present invention has been made in order to solve the problems of the prior art, such as the difficulty in inserting the wiper blade rubber into the holding member.

[Means for Solving the Problems] The wiper blade rubber of the present invention comprises: an integrally formed thick-walled base; a swinging portion having a substantially triangular cross section that is continuous through the base and the neck; In an elongated wiper blade rubber consisting of a thin plate-shaped lip provided at the tip of the swinging portion, the base includes a neck provided on the opposite side of the neck and a lip provided at the tip of the neck. and a head wider than the neck; the cough-locking projection has a recess between the picture body edge of the head and the neck; By pressing the head of the locking protrusion against the holding member and bending the image edge of the head, the head can be inserted into the holding member, and the image edge of the inserted hindlimb head is bent. The device is characterized in that it is configured to be locked to the holding member at the portion.

The wiper blade rubber of the present invention can generally be used for wipers of automobiles, but in some cases, it can also be used for wipers applied to industrial vehicles, ships, buildings, etc.

The base means a portion within the thickness that is attached to the holding member. A typical holding member here is a backing plate, but in some cases even a holder may be used.
It could be something else. The base generally has a long shape extending in one direction. The cross-sectional shape of the base is appropriately set depending on the type of wiper blade rubber. The swinging portion has a substantially triangular cross section and is continuous with the base portion via the neck portion. The neck portion is usually provided at the center of one side of the swinging portion, which has a substantially triangular cross section. This swinging part is a part that swings when the wiper blade rubber slides back and forth on a surface such as a glass surface.
It bends to the right or left around the neck, thereby swinging left and right with respect to the base.

The lip portion refers to a thin plate-shaped protruding portion provided at the tip of the swinging portion having a substantially triangular cross section.

The lip portion performs a wiping action by slidingly contacting a surface such as a glass surface. For the lip portion, the conventional structure can be used as is.

By the way, the above-mentioned base includes a locking protrusion composed of a neck and a head. The neck of the locking protrusion is provided at a portion of the base opposite to the neck. The head of the locking protrusion is provided at the tip of the neck so that the width is wider than the neck.

The cross-sectional shape of the head is preferably a shape that tapers toward the tip of the head, and particularly preferably a shape that is symmetrical with respect to the center line of the neck. Therefore, it is preferable that the cross-sectional shape of the locking projection is an open umbrella shape. The locking protrusions are preferably formed continuously along the length of the base.

The locking protrusion may be formed of the same rubber as the rubber that constitutes the base, or may be formed of a different rubber.

Note that when the locking protrusion is made of diene-based flexible rubber, only the surface portion of the locking protrusion can be treated with chlorine to make it hard. Further, the locking protrusion can also be made of high hardness rubber. The locking protrusion may also be made of hard resin such as polyethylene or polypropylene.

The locking projection has a recess between the picture body edge of the head and the neck. This recess is open at one end, as illustrated in FIGS. 1 and 2. This recess has the function of bending the edge of the image on the head.

FIG. 1 schematically shows a typical example in which the holding member is a backing plate 80 and a locking protrusion is locked in a hole 80a of the backing plate 80. This locking protrusion 150 has an umbrella-like cross-sectional shape, and is composed of a neck 110 and a head 100 wider than the neck 110, and between the neck 110 and the outer edge 100a of the head 100. is provided with a recess 160. Here, the width H of the millimeter IV hole 80a formed in the backing plate 80 as a holding member is 1. For example, the width I of the neck 110 is about 0.5 mm, the width J of the recess 160 is about 2.4 mm, and the width of the outer edge 100a of the head 100 is about 0.5 mm. The height of the head 100 may be approximately 1.5 mm, and the inner surface 160 of the recess 160 may be approximately 3.0 mm.
The inclination angle θ of a can be, for example, about 20 to 50 degrees. However, it is not limited to the above numerical values.

The wiper blade rubber of the present invention is generally manufactured by extrusion molding. In this manufacturing method, unvulcanized rubber constituting the wiper blade rubber is extruded in multiple colors to create a long extruded material with a constant cross section. This extruded material is typically
, is an elongated body with a constant cross section, in which two wiper blade rubbers are integrally joined at the tip of the lip portion. This extruded material is heated to a vulcanization temperature to be vulcanized, and then a cutter is inserted into the center portion where the lip portion is formed to create two wiper blade rubbers.

Incidentally, the extrusion molded material itself can be formed by directly employing a conventional multicolor extrusion molding method for rubber.

Now, when attaching the wiper blade rubber of the present invention to a holding member, the wiper blade rubber is relatively moved in its thickness direction. Then, the head of the locking protrusion is pressed against the holding member, thereby bending the outer edge of the head. When the outer edge of the head is bent in this way, the width of the entire head becomes smaller, and as a result, the head can be inserted into the holding member. When the head whose width has been reduced is inserted into the holding member, the outer edge of the head returns to its original shape by its own elastic force, and as a result, the head is locked to the holding member.

[Effects of the Invention] In the wiper blade rubber of the present invention, the base portion is composed of a neck portion provided on the opposite side of the neck portion and a head portion provided at the tip of the neck portion and having a width wider than the neck portion. A locking projection is provided, the locking projection has a recess between the outer wound edge of the head and the neck, the head of the locking projection is pressed against the holding member, and the locking projection is pressed against the holding member. By bending the outer edge of the wound, the head can be inserted into the holding member, and the outer edge of the inserted hind limb head can be locked to the holding member. It is something.

Therefore, by relatively moving the wiper blade rubber in the thickness direction, the wiper blade rubber can be attached to the holding member as described above, and unlike the conventional technology, the wiper blade rubber can be moved in the longitudinal direction. There is no need for relative movement. Therefore, the work of attaching the wiper blade rubber to the holding member is easier than in the prior art.

Of course, after the outer edge of the wound is bent and the head is locked to the holding member, the outer edge of the wound will return to its original shape due to its own elastic force, so it will not be possible to prevent the outer edge of the wound from being affected by normal external force. The head never comes out from the holding member.

[Example] A first embodiment of the present invention is shown in FIGS. 2 to 6.

This wiper blade rubber has a base 1 with a polygonal cross section,
- Consists of a neck portion 2, a swinging portion 3 having a substantially triangular cross section, and a lip portion 4 provided at the tip of the swinging portion 3.

As shown in FIG. 2, the base 1 has a first wing portion 12 having a wide width, a waist portion 13 having a narrower width than the first wing portion 12, and a second wing portion 14 having a width wider than the waist portion 13. Furthermore, the base 1 has a locking protrusion 15 on the center side of the upper surface. This locking protrusion 15
consists of a neck part 11 that projects upward from the center of the first wing part 12 so as to be opposite to the neck part 2, and a head part 10 that is provided at the tip of the neck part 11 and is wider than the neck part 11. It is configured. Note that the head portion 10 of the locking projection 15 is tapered. This locking protrusion 15 has a recess 16 between the outer edge 10a of the head 10 and the neck 11, as shown in FIG. This recess 16 allows the outer edge 10a of the head 10 to bend toward the neck 11, that is, in the direction of arrow X.

The base portion 1, neck portion 2, swing portion 3, lip portion 4, and locking protrusion 15 of this wiper blade rubber are made of flexible rubber A (see Fig. 2) mainly made of EPDM rubber. The outer part is made of styrene-butadiene rubber B, and the surface layer of the outer part of the lip part 4 is a chlorinated layer B'' obtained by chlorinating the styrene-butadiene rubber B.

By the way, the height from the tip of the lip portion 4 of this wiper blade rubber to the tip of the head 10 of the locking protrusion 15 is approximately 12 mm, and the width between the first wing portions 12 is approximately 8 mm.
The thickness of the lip portion 4 is 0.9 mm.

This wiper blade rubber was manufactured as follows. That is, as shown in FIG. 3, an extrusion-molded material having a shape in which two wiper blade rubbers are joined at the tip of the lip portion 4 is manufactured, and then this extrusion-molded material is inserted into a molten salt vulcanization tank. It was vulcanized at ℃ for 5 minutes to obtain a vulcanized rubber. Then 0.
After chlorination with a 4% trichloroisocyanuric acid solution, the vulcanized rubber was cut along the center with a sharp knife to produce the wiper blade rubber of this example whose cross section is shown in FIG.

By the way, FIGS. 5 and 6 show a state in which the wiper blade rubber of this example is mounted on the holder 6. In this manner, when the wiper blade rubber of this example is mounted on the holder 6, the head 10 of the locking protrusion 15 is locked in the hole 8a formed in the backing plate 8 as a holding member.

Here, the backing plate 8 serving as a holding member mainly has the function of imparting rigidity to the base 1 in the longitudinal direction thereof.

In order to lock the head 10 of the locking protrusion 15 in the hole 8a of the backing plate 8 as described above, the procedure shown in FIG.
A) As shown in (8), by relatively moving the wiper blade rubber in its thickness direction, the locking protrusion 15
A backing plate 8 as a member holding the head 10 of the
The head 10 is pressed against the peripheral edge 8b of the hole 8a.
Both outer edge portions 10a of are bent toward the neck portion 11, that is, in the direction of the arrow X. In this way, while bending both outer edges 10a, the head 1
When the head 10 is pushed into the hole 8a of the backing plate 8, the head 10 is inserted into the hole 8a of the backing plate 8. After the head 10 is inserted into the hole 8a, both outer edges 10a of the head 10 are restored to their original shape by their own elastic force. Therefore, Fig. 4(C)
As shown in FIG. 2, the outer edge 10a of the head 10 is locked to the peripheral edge 8b of the hole 8a of the backing plate 8, so that the head 10 is attached to the hole 8a of the backing plate 8 as a holding member.
is locked.

In this embodiment, a recess 16 is formed between the outer edge 10a of the head 10 and the neck 11, but if the head 10 is made of relatively flexible rubber, the recess 16 is not formed. When an external force is applied in the axial direction of the neck portion 11, the outer edge portion 10a of the head portion 10 can be provided with cushioning properties.

Therefore, even if the glass surface that the tip of the lip portion 4 contacts is a curved surface, it is possible to improve the ability to follow the curved surface compared to a case where the recess 16 is not formed. Note that the neck 11 of the locking projection 15 and the outer edge 10a of the head 1o
By making the joining portion 10e (see FIG. 2) thinner, sufficient deflection of both outer edges 10a of the head 10 toward the neck 11 can be obtained.

FIG. 7 shows a different embodiment of the invention. The wiper blade rubber in this example basically has almost the same shape as in the previous embodiment. However, in the wiper blade rubber of this example, the entire locking protrusion 15, the upper part of the first wing part 12, and the lip part 4 are made of chlorinated, high hardness diene rubber with a small coefficient of friction. Also, the first wing section 12
The lower part, the waist part 13, the second wing part 14, the neck part 2, the swinging part 3, and the lip part 4 are made of EPDM rubber.

[Brief explanation of drawings]

FIG. 1 is a sectional view schematically showing essential parts of the present invention. 2 to 6 show an embodiment of the present invention, FIG. 2 is a sectional view of wiper blade rubber, FIG. 3 is a sectional view of an extruded material, and FIG. 4 is (A), (B), C) is a sectional view of the main part showing the process of locking the locking protrusion to the holding member, FIG. 5 is a perspective view of the wiper blade rubber attached to the holding member,
FIG. 6 is a sectional view of the wiper blade rubber attached to the holding member. FIG. 7 shows a different embodiment of the present invention, and is a sectional view of a wiper blade rubber. In the figure, 1 is the base, 2 is the lip part, 3 is the swinging part, and 44 is the second part.
Wing part, 15 is a locking projection, 1o is a head of the locking projection, 1
1 indicates the neck of the locking protrusion, and 16 indicates the recess. Patent applicant: Toyoda Gosei Co., Ltd. Agent Patent attorney: Madoka Okawa Patent attorney: Shudo Fujitani Patent attorney: Akio Maruyama Figure 1 Figure 3 Figure 4

Claims (2)

[Claims] (1) An integrally formed thick base, a swinging part with a substantially triangular cross section that is continuous through the base and neck, and a thin plate-shaped lip provided at the tip of the swinging part. In the long wiper blade rubber, the base is composed of a neck section provided on the opposite side of the neck section, and a head section provided at the tip of the neck section and wider than the neck section. A locking projection is provided, the locking projection has a recess between both outer edges of the head and the neck, the head of the locking projection is pressed against the holding member, and the locking projection is By bending both outer edges of the head, the head can be inserted into the holding member, and after insertion, the outer edges of the head are locked to the holding member. wiper blade rubber. (2) The wiper blade rubber according to claim 1, wherein the locking projection has an umbrella-like cross-sectional shape.